Knowledgebase
User email address is "marked as invalid"
Situation

Emails were getting delivered as normal and they stopped getting delivered.

  • Looking at the log it says: "550 5.7.1 Recipient {or Sender} address rejected: User email address is marked as invalid"

  • I cannot find user account in the logs, but user was receiving emails.
Solution

This often occurs after a discovered address expires without any action having been taken by the admin. If the email address is in fact desired to be able to send and receive email, it should be removed from the Marked Invalid List.

  1. Find if the email account is on the Marked Invalid List
  2. Removing from the Marked Invalid List

Find if email is on the Marked Invalid List and Removing it from that List

Description or other notes about this first multi-step task

1. Click on the Users & Groups.
2. Click on the SMTP Discovery tab.
3. Click on the drop down menu and select Marked as Invalid List.
4. Find the email on the list and check the box besides it
5. Click on the drop down menu Select and click on Remove from Invalid List
6. Click on Apply

* Remember you need to create the user after doing this. Removing from the invalid list will not create the user automatically

Invalid email addresses are summarized in our SMTP Discovery reports, which have been running weekly since Jan 2011.

See: SMTP Discovery for more information on SMTP Discovery reports

To minimize administration requirements and to ensure an accurate email list for future reference, please consider using Active Directory Sync or Azure Active Directory Sync.

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